Jedi (implicit)

Upload
cfk 
Category
Entertainment & Humor

view
1.717 
download
5
description
Transcript of Jedi (implicit)
Yoda
SCRIBE EPISODE 4:Return of the Jedi
SCRIBE EPISODE 4:Return of the Jedi
So, Some people (those who are not in our class, or weren't there yesterday) reading this Scribe post may be a
little confused by the title.
The title is as such because Mr. K. actually started off the class with a couple "Jedi mind tricks"!!! Isn't that
awesome?!?!
I won't go into detail, but let's just say:
THERE ARE NO GREY ELEPHANTS IN DENMARK!!!
And so I begin the Calculus Related part of this Scribe post...
SCRIBE EPISODE 4:Return of the Jedi
Well, Mr. K. then shoed us a couple pictures (man I wish the slides were up) with questions pertaining the existence of somethings that were not shown in the pictures, but were
eluded to by certain hints in these pictures.
i.e. You see a shadow of person on the ground, but have not turned around to see this person yet. Is there someone behind you???
When we gave an answer he asked us why? We said because it is implied. There aren't any visuals of the objects in question,
but certain evidence allows us to imply that they exist.
This leads to the topic of the day:IMPLICIT FUNCTIONS!!!
SCRIBE EPISODE 4:Return of the Jedi
So we moved on to a quick review of composite functions and the chain rule, because we would have to use it later
on in the lesson.
In one example the answer was:
SCRIBE EPISODE 4:Return of the Jedi
Then we were asked to identify THIS function:
SCRIBE EPISODE 4:Return of the Jedi
It is, of course, a SEMI CIRCLE
SCRIBE EPISODE 4:Return of the Jedi
Now what's the equation of the full circle???
SCRIBE EPISODE 4:Return of the Jedi
SCRIBE EPISODE 4:Return of the Jedi
SCRIBE EPISODE 4:Return of the Jedi
And that can be drawn as...
SCRIBE EPISODE 4:Return of the Jedi
22
2
2
SCRIBE EPISODE 4:Return of the Jedi
However, a circle is not a function. But, is there a function (besides √4x2 and its opposite: √4x2) that is a
part of the circle???
SCRIBE EPISODE 4:Return of the Jedi
Sure there is: There's this one...
22
2
2
SCRIBE EPISODE 4:Return of the Jedi
22
2
2
And this one...
SCRIBE EPISODE 4:Return of the Jedi
And this one...
22
2
2
SCRIBE EPISODE 4:Return of the Jedi
Do you understand that there are an infinite amount of functions with x as the
variable?
All of these functions hidden in the main graph of a circle, are
IMPLICIT FUNCTIONS!!!
SCRIBE EPISODE 4:Return of the Jedi
Now think of a relation such as the circle given previously, and think how you would find the derivative
of any given point in the domain that relation?
There are infinite implicit functions, so who knows which one you should find the derivative of because there are
many of these functions that go through the same points!
SCRIBE EPISODE 4:Return of the Jedi
The only way to find the derivative of a circle at any given point is by finding the
derivative of the relation using the following derivation:
SCRIBE EPISODE 4:Return of the Jedi
First of all, let's use the following equation of a circle:
SCRIBE EPISODE 4:Return of the Jedi
Now let's find the derivative:
SCRIBE EPISODE 4:Return of the Jedi
First rewrite it as such:
SCRIBE EPISODE 4:Return of the Jedi
Now we can recognize that the derivative of 25 is always 0.
SCRIBE EPISODE 4:Return of the Jedi
Next, use the chain rule on the left side of the equation...
remember it is:
SCRIBE EPISODE 4:Return of the Jedi
Identify ƒ(x), g(x), and their derivatives:
The reason why the inner function "g(x)" is simply "y" is because the inner function of y^2 is an implicit function. We do not know exactly what it is, but we know it is there.
SCRIBE EPISODE 4:Return of the Jedi
Did everyone see the red text on the previous slide? It is very important!
The reason why the inner function "g(x)" is simply "y" is because the inner function of y^2 is an implicit function. We do not know exactly what it is, but we know it is there.
SCRIBE EPISODE 4:Return of the Jedi
Anyway, now using the outer and inner functions, complete the chain rule:
SCRIBE EPISODE 4:Return of the Jedi
Now combine it with the derivative of x2
(2x) and you have the derivative of the left side of the equation...
SCRIBE EPISODE 4:Return of the Jedi
therefore...
SCRIBE EPISODE 4:Return of the Jedi
Now solve for " y' "...
SCRIBE EPISODE 4:Return of the Jedi
So now we know that the derivative (slope of the tangent line) at any given point on
the circle x2 + y2 = 25 is given by the following formula
SCRIBE EPISODE 4:Return of the Jedi
So let's test it out.
Let's say we need to find the derivative of the previous function at x=3.
SCRIBE EPISODE 4:Return of the Jedi
First, find the output of when x=3:
SCRIBE EPISODE 4:Return of the Jedi
The next step is simple. To find the derivative at that point, plug the coordinates into the
equation of the derivative of the circle:
SCRIBE EPISODE 4:Return of the Jedi
The derivative (slope of the tangent) at x = 3 is (3)/4... Let's see if that is true.
SCRIBE EPISODE 4:Return of the Jedi
So yes, the derivative (slope of the tangent) at any point of any circle with its center at the
origin (because the derivative of the constant will always be zero) is given by:
SCRIBE EPISODE 4:Return of the Jedi
From there, Mr. K. gave us some examples to try and find the
derivative functions of relations (which could have been seen on
the slides if they were up).
SCRIBE EPISODE 4:Return of the Jedi
Then one final point was made:
When the numerator of the derivative function of the relation
is 0, the tangent is a horizontal line.
When the denominator is 0, then the tangent is a vertical line.
(as seen on the next slide)
SCRIBE EPISODE 4:Return of the Jedi
SCRIBE EPISODE 4:Return of the Jedi
Yoda
About it, that is...
For reading, thank you...
GreyM, the next scribe is...